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Genetic Differentiation between Up- and Downstream Populations of Tribolodon hakonensis (Pieces: Cyprinidae)  

Lee, Sihn-Ae (Dept. of Life Sciences, Yeungnam Univ.)
Lee, Wan-Ok (Inland Fisheries Research Institute, NFRDI)
Suk, Ho-Young (Dept. of Life Sciences, Yeungnam Univ.)
Publication Information
Korean Journal of Environment and Ecology / v.26, no.4, 2012 , pp. 475-483 More about this Journal
Abstract
Tribolodon hakonensis(Cypriniformes; Leuciscinae) is anadromous; they are born in freshwater, migrate back to the ocean, then return to their home stream for spawning from mid-March to early-June. Here, five microsatellites were used to assess the level of gene flow among T. hakonensis populations from the Samcheok-Oship Stream, South Korea. The frequencies of dominant alleles across several loci differed between down-and upstream populations divided by several weirs, and pairwise multilocus $F_{ST}$ estimate was significantly high(0.083). However, there were no signs of any loss of genetic variation in the upstream population. Assignment tests of individuals in admixture model(K=2) to a set of baseline samples showed fairly correct assignment to each cluster; all of upstream individuals sere included in the first cluster, while the majority of downstream individuals(65%) comprise the second cluster. These results indicate reduced gene flow between up- and downstream populations but allowing passive downstream drift. It is likely that man-made structures might at least partially be a factor for creating and consolidating the current distribution patterns of genetic variation among T. hakonensis populations in the Samcheok-Oship Stream. This information will assist governing agencies in making informed decisions regarding conservation of anadromous fishes in Korean drainage systems.
Keywords
LEUCISCINAE; MICROSATELLITES; POPULATION GENETIC STRUCTURE; ANADROMOUS FISHES;
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